SQL语法基础之DROP语句

　　　　　　　　　　　　　　　SQL语法基础之DROP语句

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　作者：尹正杰

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一.查看DROP帮助信息

mysql> ? DROP
Many help items for your request exist.
To make a more specific request, please type 'help <item>',
where <item> is one of the following
topics:
   ALTER TABLE
   DEALLOCATE PREPARE
   DROP DATABASE
   DROP EVENT
   DROP FUNCTION
   DROP FUNCTION UDF
   DROP INDEX
   DROP PROCEDURE
   DROP RESOURCE GROUP
   DROP ROLE
   DROP SERVER
   DROP SPATIAL REFERENCE SYSTEM
   DROP TABLE
   DROP TABLESPACE
   DROP TRIGGER
   DROP USER
   DROP VIEW

mysql> 
mysql> 

 

二.DROP  DATABASE

　　DROP DATABASE语句用来删除数据库操作，即删除了数据库也删除数据库里的所有表。

1>.查看DROP DATABASE的帮助信息

mysql> ? DROP DATABASE
Name: 'DROP DATABASE'
Description:
Syntax:
DROP {DATABASE | SCHEMA} [IF EXISTS] db_name

DROP DATABASE drops all tables in the database and deletes the
database. Be very careful with this statement! To use DROP DATABASE,
you need the DROP privilege on the database. DROP SCHEMA is a synonym
for DROP DATABASE.

*Important*:

When a database is dropped, privileges granted specifically for the
database are not automatically dropped. They must be dropped manually.
See [HELP GRANT].

IF EXISTS is used to prevent an error from occurring if the database
does not exist.

URL: http://dev.mysql.com/doc/refman/8.0/en/drop-database.html


mysql> 

mysql> ? DROP DATABASE